A propulsion car, usually a locomotive today.
The first trains used people power, horse power, and gravity. Sail power was even tried in the early 1800's in the US. Then steam locomotives, followed by diesel locomotives, followed by electric locomotives, - Today, electric is the most common for passenger trains with diesel the most common for freight trains. Today, some trains distribute their propulsion along multiple cars and don't need a locomotive (referred to as MU, for multiple unit).
tracks
This depends on the type of train. There are diesel trains, electric trains. Electric trains are run by electricity through motors.
Trains.
Very low coefficient of friction.
The drive train of an automobile would consist of whatever makes the vehicle move such as engine, transmission, driveshaft, differential(s), axles and so on.
By trains, buses & walking!
it moves by puttig coal in it
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They use freck'in wheels!
Diesel trains are louder than electric trains because you the noise that the diesel engine makes, which is louder than the electric engine.
It makes them self guiding.
Alas, no. What makes it worse is that very few stations have them either. EDIT: the RER trains have toilets. The metro trains don't.
Its not the speed over the roadbed that counts (all 3 are about the same) but the fact that unit trains do not need to be classified at each intermediary yard that makes them the "fastest".